rpatil524 / huginn / 27162396894

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Handle native JSON values in JSON serializer

During native JSON column migration or mixed boot paths, Active Record can
still route a serialized attribute through JsonWithIndifferentAccess even
though the database adapter has already decoded the JSON column value into a
Hash.  That inconsistent state makes the legacy serializer call JSON.parse on
the Hash and fail with "no implicit conversion of Hash into String".

Only parse String input as JSON so already-decoded Hash values are wrapped
with indifferent access.  Keep parser error handling scoped to JSON.parse and
cover string, hash, and nil inputs.

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